Rare pre war Dutch marines gasmask named J. De Jong

Rare original pre war Dutch marines gasmask in untouched condition. The gasmask and filter are nicely dated 1938. The canister is nicely numbered Z. III 4599 (Zeemilicien) which is number matching to its gasmask. The gasmask is named on the top to J. de Jong and is accompanied with a set of 5 period navy postcards all dated 1940 written to his friends and family. A very nice set in very good condition that would be hard to upgrade and possibly a nice base for further research!